DE202005011659U1 - Grinding unit comprises a changeable glide ring which is mounted on the edge of the grinding disk hood, and is adjustable so that its front edge and the front face of the grinding disk are level with one another - Google Patents

Abstract

The hand-held grinding unit comprises a changeable glide ring (12) which is mounted on the edge of the grinding disk hood (3), and is adjustable so that its front edge and the front face of the grinding disk (4) are level with one another.

Description

The Invention is based on a grinder with the in the preamble of Claim 1 specified characteristics. Such a sander is commercially available known. It serves builders and do-it-yourselfers to the most eroding Processing of surfaces, especially of walls and ceilings in buildings. The known grinder has a head part, in which a sanding plate is rotatably mounted. The sanding pad is covered by a hood, which has a Sanding pad has surrounding edge. The headboard is swiveling a handle is attached, with which the headboard are guided over walls and ceilings of a building can. To drive the sanding plate is an electric motor. It is known not to provide the electric motor on the head part, but on the body to carry it and by a flexible shaft with the axis of the sanding plate connect to. In this way, the weight of the engine when handling must with the grinder no over whose stem will be caught. Sanding dust can be vacuumed with a vacuum cleaner be connected to the hood. It is known by the hood to guide a flexible hose to a vacuum cleaner you carry in the manner of a backpack.

In spite of the fact that in the known grinder the drive is not on the headboard is intended to work with such a sander for the craftsman tiring, especially when working overhead on a ceiling.

Of the present invention has for its object to show a way How to work with such a grinder can be facilitated without making it much more expensive.

These Task is solved through a grinder with the features specified in claim 1. Advantageous developments The invention are the subject of the dependent claims.

The new grinder has a head part, a handle which is pivotally mounted on the head part, at least one rotatably mounted on the head part sanding plate and a drive unit for this, a hood which covers the at least one sanding pad and surrounds it with its edge, and provided on the hood connecting device for one Vacuum cleaner. At the edge of the hood replaceable a sliding ring is attached. The at least one sanding pad and the slip ring are relative mutually adjustable so that the front edge of the sliding ring and the front of the sanding plate are aligned. On this way can be Achieve that when the at least one sanding plate on the surface led to a wall or ceiling and she works, the slip ring slides over the same surface and thereby the gap between the hood and the machined surface for the suction air flow largely or completely closes. Then can create a vacuum through the vacuum cleaner under the hood sufficient to hold the headboard to the wall. The required for it Underpressure may well be generated by a commercial vacuum cleaner Because the hood covers the grinding wheel, it has one considerable Size that in addition to the achievable negative pressure for the achievable holding force is co-determinant.

In order to Dust can be sucked, air must be sucked under the hood can. Since the sliding ring on a rough surface, for. On a plaster, slides, and the sliding ring is exposed to wear roughening him and something can be uneven, despite the sliding of the Sliding ring on the surface to be processed through the residual gap between sucked air under the hood to the slide ring and the surface to be machined become. For the case that the thereby obtained air access under the hood is too low to effectively suck the sanding dust, and that as a result the pressure reduction under the hood is so great that the hood is too much sucked to the surface to be machined and only hard about the surface can be pushed, the hood is preferably at least an opening provided by which additional Air can be sucked in, which is also referred to here as false air. The effective cross section of such an opening is preferably variable, z. B. by an adjustable aperture. This makes it possible for the craftsman, the Access of false air so optimally adjust the headboard due to the negative pressure under the hood at the to be processed Surface held, but, nevertheless, they are passed over without special effort can.

is The sliding ring worn after some time, it can be replaced.

• – Das erfindungsgemäße Schleifgerät findet selbsttätig Halt an der zu bearbeitenden Wand oder Decke.
• – Für den Handwerker oder Heimwerker wird das Arbeiten mit dem Schleifgerät sehr erleichtert, insbesondere beim Arbeiten über Kopf.
• – Die Erfindung erreicht ihr Ziel mit einfachsten Mitteln, nämlich mit einem preiswert herzustellendem Gleitring, welcher bei fortgeschrittenem Verschleiß ausgewechselt werden kann, sowie durch eine einfache Verstellbarkeit der Haube relativ zu dem wenigstens einen Schleifteller.
• – Dadurch, dass sich das Kopfteil nunmehr selbsttätig an der zu bearbeitenden Fläche halten kann, kann das Antriebsaggregat für den wenigstens einen Schleifteller unmittelbar am Kopfteil angebracht werden. Eine biegsame Weile zwischen dem Kopfteil und einem entfernt aufgestellten oder am Körper des Handwerkers getragenen Motor ist entbehrlich. Das zusätzliche Gewicht des Antriebsagregats muss der Handwerker nur vorübergehend tragen, nämlich bis er das Kopfteil zur Anlage an der zu bearbeitenden Oberfläche gebracht hat.
• – Durch eine einfache verstellbare Blende vor oder hinter einer zusätzlichen Öffnung in der Haube kann die Haltekraft optimiert und die Reibung minimiert werden, welche auftritt, wenn das Kopfteil über die zu bearbeitende Fläche geschoben wird.

The invention has significant advantages:

• - The grinding device according to the invention automatically finds support on the wall or ceiling to be processed.
• - For the craftsman or handyman, working with the grinder is greatly facilitated, especially when working overhead.
• - The invention achieves its goal with the simplest means, namely with an inexpensive to produce sliding ring, which can be replaced with advanced wear, and by a simple adjustability of the hood relative to the at least one sanding pad.
• - The fact that the head part can now hold automatically on the surface to be machined, the drive unit for the at least ei NEN sanding plate are attached directly to the headboard. A flexible while between the headboard and a remotely placed or worn on the body of the craftsman engine is unnecessary. The additional weight of the Antriebsagregats the craftsman must wear only temporarily, namely until he has brought the headboard to rest against the surface to be machined.
• - By a simple adjustable aperture in front of or behind an additional opening in the hood, the holding force can be optimized and the friction can be minimized, which occurs when the head part is pushed over the surface to be machined.

Of the Sliding ring is preferably a plastic molding. That has the advantage that it can be produced inexpensively. There are also it plastics, which moderate wear with low Join friction coefficients. The slip ring is preferably massively trained, so not foamed, and so hard that he was Working with the grinder remains dimensionally stable. Particularly suitable are sliding rings of a thermoplastic, in particular of a polyethylene or a polyamide. You can in one piece by injection molding getting produced. But it is also possible, the slip ring from a Section of an extruded plastic profile to form, which cut to a length corresponding to the periphery of the hood length and attached to the edge of the hood, leaving the beginning and end of the plastic profile collide or at most leave a small gap open. The bending of such Plastic profiles for adaptation to the contour of the edge of the hood can by heating the plastic profile are facilitated, for. B. with an ordinary Hairdryer.

Of the Slip ring can be attached in different ways to the edge of the hood become. He can z. B. with some distributed over the circumference of the hood screws on the outside the hood can be attached. Simpler and therefore preferred it just to put the seal on the edge of the hood, from which he does not fall off while working even if he is not particularly tight, because the edge of the hood by the suction of the Dust occurring negative pressure is pressed into the seal ring. Preferably, the sliding ring is secured by that he positively on the edge of the hood is plugged. For this purpose, the hood in the neighborhood of their edge around the circumference have some holes, in which the slip ring engages with mating projections. Another possibility is to provide a groove in the hood parallel to its edge, in which a rib engages, which is formed in the circumferential direction on the sliding ring is. Very cheap is to lock the slide ring on the edge of the hood.

The Adjustment of sanding pad and hood relative to each other can be effected by one or more screws. Easier, more elegant and therefore preferred is that the at least one Sanding plate and the hood relative to each other against a spring force are adjustable, which the hood relative to the at least one Tried to advance sanding plate. As a result, the edge the hood with the sliding ring located thereon in the advanced End position over protrudes the front of the sanding plate. Under the front of the sanding plate is here acting on the surface to be machined Side of the grinding plate called. Is the head part of such a grinder to the laid surface to be worked, then only the spring force has to be overcome, around the sanding plate or to bring the sanding pads to rest against the surface to be worked. The one for it required force can be low, because the springs only in the Need to be able to Reset the hood to its advanced end position.

The resilient connection between the at least one sanding pad and the hood is preferably made by the fact that the Hood over Strut, which is parallel to the axis of rotation of the at least one Extend sanding plate, supported on a support on which the stem or indirectly is directly attached. The carrier may be z. B. by one Act plate, which carries a pivot bearing for the stem and also a drive unit for the at least one sanding pad can wear. The struts, from which preferably several are present, preferably three or more than three struts, can the hood relative to the at least one sanding pad with limited Lead game and at the same time limit the adjustment path between sanding pad and Hood.

One embodiment The invention is illustrated schematically in the accompanying drawings.

1 shows an inventive grinding device in an oblique view and

2 shows a partially sectioned side view of the head portion of the grinder 1 ,

The sander has a headboard 1 and a stalk 2 , which pivots on the headboard 1 is appropriate. The headboard 1 has a hood 3 , which a sanding plate 4 surrounded by a drive unit 5 can be driven, which may be a combination of an electric motor and a transmission. The drive unit 5 is on a plate 6 attached, which parallel to the sanding plate 4 outside the case 3 arranged and by several struts 7 with the hood 3 connected is. The struts 7 of which only one is shown are at regular intervals about the axis of rotation 8th of the sanding plate 4 arranged. At the hood 3 is also a connection piece 9 provided, on which a hose can be inserted, which leads to a vacuum cleaner, not shown. The hose can be replaced by a handle 2 provided bracket 10 on a stick 2 be guided along.

On the edge 11 the hood 3 is a sliding ring 12 plugged. The sliding ring 12 has a J-shaped profile in radial section. In the sliding ring 12 it is preferably a molding of a dimensionally stable, thermoplastic material, in particular of polyethylene. The 2 shows the slip ring 12 in a position in which the hood 3 against the action of the struts 7 provided coil springs is pushed back to the sanding plate 4 make it clearer. Leave the hood 3 the free play of the forces of the springs on the struts 7 , then push the hood 3 so far, until the slip ring 12 over the front of the sanding plate 4 protrudes. Will the headboard 1 then placed on a surface to be machined, the sanding pad can 4 easily be pressed against this by using the stem 2 Pressure is exercised. The hood 3 then gives way to those of the struts 7 applied force back until the sanding pad 4 abuts the surface to be machined. The struts 7 same wear on the slip ring 12 and on the sanding plate 4 occurs automatically. Is the slip ring 12 worn, he can easily peeled off and through a new slip ring 12 be replaced.

In the hood 3 is at least one additional opening 13 provided by which false air can be sucked. The effective cross section of this opening 13 can by an adjustable aperture 14 changed and thereby the under the hood 3 resulting negative pressure can be optimized. Non-adjustable gaps may provide a contribution to desired secondary air, e.g. B. a gap in the implementation of the drive shaft of the sanding pad 4 through the wall of the hood 3 ,

The axis 15 to which the stalk 2 is pivotable, runs parallel to the plate 6 , Instead of a uniaxial joint and a biaxial joint may be provided, for. B. a universal joint with two mutually perpendicular crossing axes. This results in a greater mobility of the head part 1 opposite the stem 2 ,

The illustrated embodiment has only a single circular sanding pad 4 on. But it is also possible to provide two or more than two sanding plates, which are preferably driven synchronously, for. B. two oppositely driven sanding pad, as it is known from CH 658 014 A5 is known. In this case, one would provide a hood with an oval outline.

1

headboard

2

stalk

3

Hood

4

sanding pad

5

power unit

6

plate

7

Suspensions

8th

axis of rotation

9

connecting branch

10

bracket

11

edge

12

sliding ring

13

opening

14

cover

15

axis

Claims (14)

Grinder - with a head part ( 1 ), - with a handle ( 2 ), which pivotally on the headboard ( 1 ), - with at least one on the head part ( 1 ) rotatably mounted sanding pad ( 4 ), - with a drive unit ( 5 ) for the at least one sanding pad ( 4 ), - with at least one sanding pad ( 4 ) covering hood ( 3 ), which at least one sanding plate ( 4 ) surrounding edge ( 11 ), and - with one on the hood ( 3 ) connection device ( 9 ) for a vacuum cleaner, characterized in that a sliding ring ( 12 ) replaceable at the edge ( 11 ) the hood ( 3 ) and that the at least one sanding pad ( 4 ) and the sliding ring ( 12 ) are relative to each other so adjustable that the front edge of the sliding ring ( 12 ) and the front side of the sanding plate ( 4 ) are aligned with each other. Grinding device according to claim 1, characterized in that the sliding ring ( 12 ) is a molded part made of plastic. sharpener according to claim 1, characterized in that the sliding ring a Section of an extruded plastic profile is. Grinding device according to one of the preceding claims, characterized in that the sliding ring ( 12 ) is solid. Grinding device according to one of the preceding claims, characterized in that the sliding ring ( 12 ) is formed dimensionally stable. Grinding device according to one of the preceding claims, characterized in that the sliding ring ( 12 ) consists of a thermoplastic material, in particular of a polyethylene or a polyamide. Grinding device according to one of the preceding claims, characterized in that the sliding ring ( 12 ) on the edge ( 11 ) the hood ( 3 ) is plugged. Grinding device according to claim 7, characterized in that the sliding ring ( 12 ) positively on the edge ( 11 ) the hood ( 3 ) is plugged. Grinding device according to claim 8, characterized in that the sliding ring ( 12 ) on the edge of the hood ( 3 ) is locked. Grinding device according to one of the preceding claims, characterized in that the at least one sanding pad ( 4 ) and the hood ( 3 ) are adjustable relative to each other against a spring force, which the hood ( 3 ) relative to the at least one sanding pad ( 4 ) tries to advance. Grinding apparatus according to claim 10, characterized in that the hood ( 3 ) via struts ( 7 ), which are parallel to the axis of rotation ( 8th ) of the at least one sanding plate ( 4 ), on a support ( 6 ) on which the stem ( 2 ) is attached directly or indirectly. Grinding device according to one of the preceding claims, characterized in that the hood ( 3 ) at least one opening ( 13 ), through which false air can be sucked. Grinding apparatus according to claim 12, characterized in that the effective cross section of the at least one opening ( 13 ) is variable, in particular by an adjustable aperture ( 14 ). Grinding device according to one of the preceding claims, characterized in that the drive unit ( 5 ) on the headboard ( 1 ) is attached.